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1986 951 engine stumble

Engine

Vehicle Information: Year: 1986; Engine (type, size, modifications): 2.5L Turbo; Total Mileage: 43,000;

I have been experiencing a stumble in the engine where the engine would stumble while driving. The experience is similar to the engine hitting the rev limiter but of course at lower RPMs. While attempting to restart the engine I can usually smell gas and hear pops bangs from the muffler.I replaced the air flow sensor but that did not fix the problem. I installed a new fuel pressure regulator and fuel check valve approximately two years ago.

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